7AT Downshift Rev Match (DRM) control

DarkJak · 11-22-2022, 05:12 PM

I've seen some discussion around SRM for 6MTs, but having trouble finding what the car does for throttle blips on the 7AT.

Nissan's revmatch control on the 7AT is a lot better than many cars I've driven from the era, though most newer automatics blip just as well and as accurately.
From my observations, it does seem like similar logic is used: Shift is started (down paddle in auto, gear position sensor in manual) > Target gear defined > Target RPM defined, and engine matches and holds target RPMs even as speed changes, until the shift is complete.

Is anyone savvy enough with the service manual or the car's control systems to give me some help on what to tap into, or what signals need to be sent to and from the ECU here from the TCM? Or where to look for this info?
The FSM talks of an engine speed control demand signal from TCM to ECU "under blipping control" on page 149 of the TM pdf. I'm at a wall here on how to actually figure out what it is though.

With HTG finally releasing closed loop DCT control, this is one of the hurdles I want to know how to overcome before kicking off the swap. Backup plan is a VR30 trans swap but...that's much less fun.

Tractionless · 11-24-2022, 10:28 AM

What swap are you trying to accomplish?

THE BULL · 11-24-2022, 11:23 AM

Seems like BMW DCT trans

The OEM system uses a a 5th VSS in the trans + gearshift sensor from a physical perspective along with Accel/Brake input.

Pin #1 APP2 Sig
Pin #2 APP2 GND
Pin #3 APP1 Sig
Pin #4 APP1 GND
Pin #5 APP1 5v
Pin #6 APP2 5v

Here's a diagram I made of the APP connector. This connector and pins are the same from 2009-2022 370z and 2007- 2013 G35/37 + Q40 and other Nissan and Infiniti that use the same style connector

11-22-2022, 05:12 PM	#1 (permalink)
DarkJak A True Z Fanatic Join Date: Jun 2011 Location: Madison, WI Posts: 1,397 Drives: 2009 370Z Rep Power: 16804	7AT Downshift Rev Match (DRM) control I've seen some discussion around SRM for 6MTs, but having trouble finding what the car does for throttle blips on the 7AT. Nissan's revmatch control on the 7AT is a lot better than many cars I've driven from the era, though most newer automatics blip just as well and as accurately. From my observations, it does seem like similar logic is used: Shift is started (down paddle in auto, gear position sensor in manual) > Target gear defined > Target RPM defined, and engine matches and holds target RPMs even as speed changes, until the shift is complete. Is anyone savvy enough with the service manual or the car's control systems to give me some help on what to tap into, or what signals need to be sent to and from the ECU here from the TCM? Or where to look for this info? The FSM talks of an engine speed control demand signal from TCM to ECU "under blipping control" on page 149 of the TM pdf. I'm at a wall here on how to actually figure out what it is though. With HTG finally releasing closed loop DCT control, this is one of the hurdles I want to know how to overcome before kicking off the swap. Backup plan is a VR30 trans swap but...that's much less fun. __________________ @stupidtoycars \| My track vids 09 7AT\|MCS 2WNR\|Topgunz Rotrex\|Ecutek (Eugene)\|Maxxis RC1\|Titan-7 TS-5\|OSG LSD\|Rear Mount Derale Oil Cooler (WIP)+25 Trans Cooler\|Fismo\|G-LOC R12/R10\|Zeta III L\|NLR Wing and Splitter\|CJM Pan and Fuel Hat\|Radium Surge Tank\|AP Racing CP9668

11-24-2022, 10:28 AM	#2 (permalink)
Tractionless A True Z Fanatic Join Date: Jan 2016 Location: Atlantic SE Posts: 1,326 Drives: '10 K23 ST 7AT Rep Power: 30525	What swap are you trying to accomplish? __________________ Toys Not Tots

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11-24-2022, 11:23 AM	#3 (permalink)
THE BULL Base Member Join Date: Apr 2021 Location: Florida Posts: 217 Drives: G37S Rep Power: 26848	Seems like BMW DCT trans The OEM system uses a a 5th VSS in the trans + gearshift sensor from a physical perspective along with Accel/Brake input. Pin #1 APP2 Sig Pin #2 APP2 GND Pin #3 APP1 Sig Pin #4 APP1 GND Pin #5 APP1 5v Pin #6 APP2 5v Here's a diagram I made of the APP connector. This connector and pins are the same from 2009-2022 370z and 2007- 2013 G35/37 + Q40 and other Nissan and Infiniti that use the same style connector